I disagree with you here. What we have works well, and it's not like you can easily get into a provincial park and not realize it — most parks (other than Alberta, IIRC) have entrance gates and require payment.
What about municipal parks? Conservation areas? There are lots of smaller authorities that have banned drones. But like Agustine said upthread, what they have banned is operating a drone from their land, not flying a drone over it, because they don't have that authority
There was a park in Toronto that started to be used for kite-fighting competitions. Strong string, often with added glass to cut other kite strings, and people were getting cut on abandoned string left behind by the competitors (not to mention the risks of low-flying fighting kites slicing someone).
Don't know if the Bluffs is where that happened or not. It was a couple of decades ago and I wasn't paying much attention.
I've flown off the Bluffs a few times. Didn't see any signs prohibiting drones (and I checked). I walk down to the lake, though, and fly from there over the water, not off the top of the Bluffs, so we may be talking about different parks.
You have to be there to see the entrance. For planning it is too late. I like to plan before I go to find where I can fly or not